Editing JPEG Images

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Hi Everyone .
I am using the bitmap class for manipulating images changing their pixel values.
But the problem is SIZE of the image.
Is there any method to reduce the size of a bitmap image without changing their pixel values.
JPEG Images has got less size .Is there any class provided to edit the JPEG pixel values ???

Thanx in advance.. :-O

Posted 18-Oct-10 3:56am

Be Yourself

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There is no built-in method to do this in the .NET Framework the way you want. Everything is handled as a full, 32-bit BMP (you might say BMP) uncompressed image in memory.

You'll need some kind of 3rd party library that handles JPG editing the way you want. I don't know of any off the top of my head.

Posted 18-Oct-10 10:20am

Dave Kreskowiak

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TheyCallMeMrJames · Accepted Answer · 2010-10-18T04:08:00

JPEG files are smaller because the image is compressed, so...the pixel values are changed. If you take a straight-up bitmap and convert it to (save it as) a JPEG, you are changing the pixel values.

There are two ways to make a bitmap file size smaller: resize the image or compress it.

When you load a JPEG into memory with the Graphics/Bitmap/Image classes in .NET you can do everything to that JPEG that you can to a bitmap image. Once you load the JPEG into memory, the .NET framework decompresses the image and you have access to the bits.

See here: http://www.codeproject.com/KB/GDI-plus/GDI_.aspx[^]

Or here: Bob Powell[^]

Cheers.